001    /**
002     * Copyright (c) 2000-2012 Liferay, Inc. All rights reserved.
003     *
004     * This library is free software; you can redistribute it and/or modify it under
005     * the terms of the GNU Lesser General Public License as published by the Free
006     * Software Foundation; either version 2.1 of the License, or (at your option)
007     * any later version.
008     *
009     * This library is distributed in the hope that it will be useful, but WITHOUT
010     * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
011     * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
012     * details.
013     */
014    
015    package com.liferay.portal.security.pacl.checker;
016    
017    import com.liferay.portal.kernel.util.JavaDetector;
018    
019    import java.security.AccessController;
020    
021    import sun.reflect.Reflection;
022    
023    /**
024     * @author Brian Wing Shun Chan
025     */
026    public class CheckerUtil {
027    
028            public static boolean isAccessControllerDoPrivileged(int frame) {
029                    frame++;
030    
031                    Class<?> callerClass = Reflection.getCallerClass(frame);
032    
033                    if (callerClass != AccessController.class) {
034                            return false;
035                    }
036    
037                    Thread currentThread = Thread.currentThread();
038    
039                    StackTraceElement[] stackTraceElements = currentThread.getStackTrace();
040    
041                    if (JavaDetector.isIBM()) {
042                            frame++;
043                    }
044    
045                    StackTraceElement stackTraceElement = stackTraceElements[frame];
046    
047                    String methodName = stackTraceElement.getMethodName();
048    
049                    return methodName.equals(_METHOD_NAME_DO_PRIVILEGED);
050            }
051    
052            private static final String _METHOD_NAME_DO_PRIVILEGED = "doPrivileged";
053    
054    }